package com.yfp.common.core.utils.sign;

import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * RSA加密解密
 * 
 * @author
 **/
public class RsaUtils
{
    // Rsa 私钥
    public static String privateKey = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAMXy2dXOm0FUzFLOS9jkzrl7wc6nxmprvybxblRRgwdxoxRUz3M3VrkZj903zevaWk3FSRNKCIHq5fOTl7UjQHLRu5vhkqYmFf3MTkvlXRXhY5FPzTI1oJlbh28ROcCDMfYhkSAZgwFxfTrSQxfoXMHpMI+v54GGFCm5J3b4elq1AgMBAAECgYBhdacw8K9aJDERWAbZ/BWYF0mdwNcdEH2l49rJYvSbVqTPXs5g0M8/BUnixhX52KD7h3XqLFox9QBQw8s+4ONahxDf0T77X7km1uFwGgF0a6kOTWDZF0pEZElisaBDOvDnCce+EnTEpAdLRB2e66aj52Ro+B/fueV0PsQ2ct+o5QJBAOb2qHHq3B2NKev3FSoMZXJz/TXLaG6MQZUqYGLl3AhLMv6dJkn6cKfpxT5XOZbHqSZmBO9vqSyuNa4UjXDANW8CQQDbaAPp6LLaZS894s0fD/5btV5WtRKRtsAVh1xMGYJABAOsL41KYbiNoPPNJhYdbdgDTGZMuSAo7eHLNACd6sgbAkEAw0VNuyq3OWDtTaxUP33Fk5PPRFkajUSV+jiez17JvlVd4vkYszlDYCP8eK2kaf+a2nUsvQcqADW1+t0zjF1ljwJBAI6TvVdXnEJH1rdElz9ESWqXJcL60CJYu+JBoDzjpryq3ygZjptzfVar7UK3KU/efa1HDIN3Ger/Cufd1zjHxVkCQDygO6sGSie6IRGcbfzD1RooYNYaFdtKnPk66A7k+QnJP17QXyYcIC8xIrl41uEt1YrrruWod0iK5pL0kg5T4us=";

    public static String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDF8tnVzptBVMxSzkvY5M65e8HOp8Zqa78m8W5UUYMHcaMUVM9zN1a5GY/dN83r2lpNxUkTSgiB6uXzk5e1I0By0bub4ZKmJhX9zE5L5V0V4WORT80yNaCZW4dvETnAgzH2IZEgGYMBcX060kMX6FzB6TCPr+eBhhQpuSd2+HpatQIDAQAB";
    /**
     * 私钥解密
     *
     * @param text 待解密的文本
     * @return 解密后的文本
     */
    public static String decryptByPrivateKey(String text) throws Exception
    {
        return decryptByPrivateKey(privateKey, text);
    }

    /**
     * 公钥解密
     *
     * @param publicKeyString 公钥
     * @param text 待解密的信息
     * @return 解密后的文本
     */
    public static String decryptByPublicKey(String publicKeyString, String text) throws Exception
    {
        X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
        return new String(result);
    }

    /**
     * 私钥加密
     *
     * @param privateKeyString 私钥
     * @param text 待加密的信息
     * @return 加密后的文本
     */
    public static String encryptByPrivateKey(String privateKeyString, String text) throws Exception
    {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }

    /**
     * 私钥解密
     *
     * @param privateKeyString 私钥
     * @param text 待解密的文本
     * @return 解密后的文本
     */
    public static String decryptByPrivateKey(String privateKeyString, String text) throws Exception
    {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(Base64.decodeBase64(text));
        return new String(result);
    }

    /**
     * 公钥加密
     *
     * @param publicKeyString 公钥
     * @param text 待加密的文本
     * @return 加密后的文本
     */
    public static String encryptByPublicKey(String publicKeyString, String text) throws Exception
    {
        X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encodeBase64String(result);
    }

    /**
     * 构建RSA密钥对
     *
     * @return 生成后的公私钥信息
     */
    public static RsaKeyPair generateKeyPair() throws NoSuchAlgorithmException
    {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(1024);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
        String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded());
        String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded());
        return new RsaKeyPair(publicKeyString, privateKeyString);
    }

    /**
     * RSA密钥对对象
     */
    public static class RsaKeyPair
    {
        private final String publicKey;
        private final String privateKey;

        public RsaKeyPair(String publicKey, String privateKey)
        {
            this.publicKey = publicKey;
            this.privateKey = privateKey;
        }

        public String getPublicKey()
        {
            return publicKey;
        }

        public String getPrivateKey()
        {
            return privateKey;
        }
    }

}